Up to now, all amendments have been proposed and implemented as codicils appended to the main body of the Constitution. If at least two-thirds of the legislatures of the states so request, Congress is required to call a convention for the purpose of proposing amendments. This provision, many scholars argue, checks the power of the Congress to limit potential constitutional amendments.
1 The pulmonary veins carry oxygenated blood from the lungs into the left atrium where it is returned to systemic circulation.  The aorta is the largest artery in the body. It carries oxygenated blood from the left ventricle of the heart into systemic circulation.
The aorta is the largest pathway of the circulatory system. Arteries are also a part of this system. They move blood from one location to another throughout the body. The aorta is the largest pathway of the circulatory system. Arteries are also a part of this system. They move blood from one location to another throughout the body.